Ice-box.



No. 669,939. ,Patented mar; |'2, |901. F. GERHARD e. L. ANwANDEn.

ICE BOX.

` (Application filed Feb. 13, 1900.! N o M o d el.)

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:UNITED STATES PATENT FFICE.-

FRITZ GERHARD AND LUDWIG ANWANDER, OF ZURICH, SWITZERLAND.

ICE-Box.

SPECIFICATION formingpart` of Letters Patent No. 669,939, dated March12, 1901.

Application ledlehrnary 13, 1900. Serial No. 5,117, LND model-'1 To LZZwhom, it may concern:

Be it known that We, FRITZ GERHARD and LUDWIG ANWANDER, subjects oftheEmperor of Germany, residing at Zurich, Switzerland, have inventedcertain new and useful Improvements in Ice-Boxes; and we do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

The present invention relates to an improved ice-box for household andcommercial purposes, which consists of a double-walled door, a doubledoor, and a double-walled wooden box in which the ice-box is placed overthe cooler. The double walls and the double floor form intermediatespaces, which are con nected with each other, as well as with icebox andcooler, so that when the ice-box is closed the air may circulate throughall the parts of the interior of the ice-box. By this arrangement a dryand low temperature is obtained in the ice-box and the sweating of thesaine is avoided. The circulation of the air between the ice-box and thecooler, on the one hand, and the intermediate walls touching theseparts, as Well as the intermediate parts of the door and walls to whichthey are attached, is effected through openings in said walls. Toprevent the entrance and outlet of air when the door is opened, (betweenthe cooler and the intermediate parts communieating with it,) theopenings which eect the circulation of air are provided with valveswhich when the door is opened close 'automatically and which when thedoor is closed open again. By this arrangement a great saving iseffected.

The accompanying drawings illustrate the invention. H

Figure 1 is a vertical sectional view on a plane parallel with the doorswhen closed, looking to the front. Fig. 2 isa sectional View on a planecutting through one of the doors. Figs. 3 and 4 are detail sectionalviews on an enlarged scale.

Like letters of reference mark the same parts in all of the figures ofthe drawings.

The outer walls of the double-walled wooden box c and the double-Walleddoor e, as well as the outer wall of the ice-box, are covered on theirinside with a thick layer of paint p and are provided with a stout layerof cardboard q, which both layers serve as non-conducting material. Theinner walls of the wooden box c and the door e and the inner part of thefloor are lined with sheet-Zinc. To prevent leakage of water into thewall-spaces f, the openings CZ between said spaces and the ice-box a areprovided with interior protective plates or guards o. The openings g,arranged between the intermediate parts f and the cooler, are closedwhen the door is opened by springs t', which press the valve-bodies 71,into their seats on the outer sides of the inner walls. When the door isclosed, these valves are held open by the arms 71:. When the door isopened, the arms Zt retract from the valve-bodies h and the valves areclosed by the springs c'. The air circulation between the intermediatespacesf and the door e of the walls c is effected by two opposing valvesr, which cover each other when the doors are closed, which-on the onehand are placed in the frame of the door and on the other side areplaced in the edges of the door meeting this frame. The seats of thevalves, as well as the springs pressing against these valvebodies, aresituated in the intermediate parts f. To each valve-body a pin3,1eaching through theV valve-opening when the door is opened, isattached. The pins s of the valve-bodies in the frame are situatedexactly opposite to the pins of the valves in the doors, so that whenthe door is closed the two opposing pins will push against each other,when they will be pushed back on their respective valvebodies, wherebythe pressure of the opposing pins is relieved, so that the springs ofthe valve-bodies press them against their seats.

In the bottom of the box, near the back Wall, is situated a clack-valveZ, with a clack that is weighted by a prolongation n. When the door ofthe ice-box is closed, the valve Z will open on account of theair-pressure arising in the box, and part of the air heated by theopening of the door may escape. A plate o' is provided over the valve Zto prevent a loss of goods.

Having now fully described the nature of this invention, what we claimisl. The combination in a refrigerator provided with an ice-tank, acooling-chamber below it, and surrounding hollow walls forming anair-space and having openings into both tanlc and chamber, of a valve inthe air-space normally closing the opening between the air-space andcooling-chamber, a hinged door, and an arln projecting inward from thedoor in position to move and hold the valve away from its opening whenthe door is closed, substantally as described.

2. The combination in a refrigerator, of a double Wall with air-spacebetween and a double-Walled door with interior air-space, the edge ofthe door and its seat in the double Wall being provided With openingswhich register when the door is closed, of a valve in the 'eeepse

